scholarly journals Numerical Simulation of a Lifted Methane Jet Flame in a Vitiated Coflow: Lagrangian Approach with Detail Chemistry

2010 ◽  
Vol 5 (3) ◽  
pp. 211-220 ◽  
Author(s):  
Ruben Mouangue ◽  
Marcel Obounou ◽  
Donatien Njomo ◽  
Cyrille Gnemtedem
Keyword(s):  
Numerical Simulation ◽  
Lagrangian Approach ◽  
Jet Flame ◽  
Vitiated Coflow

Direct numerical simulation of hydrogen turbulent lifted jet flame in a vitiated coflow

2007 ◽  
Vol 52 (15) ◽  
pp. 2147-2156 ◽  
Author(s):  
ZhiHua Wang ◽  
JianRen Fan ◽  
JunHu Zhou ◽  
KeFa Cen
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Jet Flame ◽  
Vitiated Coflow

scholarly journals Numerical simulation of sudden-expansion particle-laden flows using the Eulerian Lagrangian approach

2011 ◽  
pp. 64-64
Author(s):  
Mergheni Mohamed ◽  
Sautet Jean-Charles ◽  
Ticha Ben ◽  
Nasrallah Ben
Keyword(s):  
Numerical Simulation ◽  
Lagrangian Approach ◽  
Sudden Expansion ◽  
Particle Laden Flows

scholarly journals Mechanism Reduction and Bunsen Burner Flame Verification of Methane

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 97
Author(s):  
Haitao Lu ◽  
Fuqiang Liu ◽  
Yulan Wang ◽  
Xiongjie Fan ◽  
Jinhu Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Laminar Flame ◽  
Propagation Speed ◽  
Bunsen Burner ◽  
Important Species ◽  
Jet Flame ◽  
Reduced Mechanism ◽  
Ignition Delay Times ◽  
Simulation Results ◽  
Propagation Methods

Based on directed relation graph with error propagation methods, 39 species and 231 reactions skeletal mechanism were obtained from Mech_56.54 (113 species and 710 reactions) mechanism of methane. The ignition delay times, laminar flame propagation speed, and important species were calculated using the simplified mechanism at different pressures and equivalence ratios. The simulation results were in good agreement with that of detailed mechanisms and experimental data. The numerical simulation of the Bunsen burner jet flame was carried out using the simplified methane mechanism, and the simulation results well reproduced the temperature, flow fields and distribution of important species at flame zone. The compact methane reduced mechanism can not only correctly respond to its dynamic characteristics, but also can be well used for numerical simulation, which is of great significance in engineering applications.

Three-dimensional direct numerical simulation of a turbulent lifted hydrogen jet flame in heated coflow: a chemical explosive mode analysis

2010 ◽  
Vol 652 ◽  
pp. 45-64 ◽  
Author(s):  
T. F. LU ◽  
C. S. YOO ◽  
J. H. CHEN ◽  
C. K. LAW
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Near Field ◽  
Three Dimensional ◽  
Mode Analysis ◽  
Scalar Dissipation ◽  
Complex Flows ◽  
Jet Flame ◽  
Auto Ignition ◽  
Grid Points

A chemical explosive mode analysis (CEMA) was developed as a new diagnostic to identify flame and ignition structure in complex flows. CEMA was then used to analyse the near-field structure of the stabilization region of a turbulent lifted hydrogen–air slot jet flame in a heated air coflow computed with three-dimensional direct numerical simulation. The simulation was performed with a detailed hydrogen–air mechanism and mixture-averaged transport properties at a jet Reynolds number of 11000 with over 900 million grid points. Explosive chemical modes and their characteristic time scales, as well as the species involved, were identified from the Jacobian matrix of the chemical source terms for species and temperature. An explosion index was defined for explosive modes, indicating the contribution of species and temperature in the explosion process. Radical and thermal runaway can consequently be distinguished. CEMA of the lifted flame shows the existence of two premixed flame fronts, which are difficult to detect with conventional methods. The upstream fork preceding the two flame fronts thereby identifies the stabilization point. A Damköhler number was defined based on the time scale of the chemical explosive mode and the local instantaneous scalar dissipation rate to highlight the role of auto-ignition in affecting the stabilization points in the lifted jet flame.

Visualization of nonpremixed hydrogen jet flame in a vitiated coflow by DNS

2007 ◽  
Vol 10 (2) ◽  
pp. 136-136 ◽  
Author(s):  
Z. Wang ◽  
J. Zhou ◽  
K. Cen
Keyword(s):  
Jet Flame ◽  
Vitiated Coflow

Numerical Modeling of a Turbulent Gas Jet Flame in a Swirling Air Stream

2002 ◽  
Author(s):  
Ala R. Qubbaj ◽  
S. R. Gollahalli ◽  
John Villarreal
Keyword(s):  
Numerical Simulation ◽  
Software Package ◽  
Reaction Model ◽  
Swirl Flow ◽  
Gas Jet ◽  
Combustion Analysis ◽  
Jet Flame ◽  
Benchmark Study ◽  
Air Stream ◽  
Mixing Rates

A numerical simulation of a turbulent natural gas jet diffusion flame at a Reynolds number of 9000 in a swirling air stream is presented. The numerical computations were carried out using the commercially available software package CFDRC. The instantaneous chemistry model was used as the reaction model. The thermal, composition, flow (velocity), as well as stream function fields for both the baseline and airswirling flames were numerically simulated in the near-burner region, where most of the mixing and reactions occur. The results were useful to interpret the effects of swirl in enhancing the mixing rates in the combustion zone as well as in stabilizing the flame. The results showed the generation of two recirculating regimes induced by the swirling air stream, which account for such effects. The present investigation will be used as a benchmark study of swirl flow combustion analysis as a step in developing an enhanced swirl-cascade burner technology.

Liftoff behaviors and flame structure of dimethyl ether jet flame in CH4/air vitiated coflow

2019 ◽  
Vol 233 (8) ◽  
pp. 1039-1046 ◽  
Author(s):  
Wei Fu ◽  
Fengyu Li ◽  
Haitao Zhang ◽  
Bolun Yi ◽  
Yanju Liu ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
High Speed ◽  
Equivalence Ratio ◽  
Flame Structure ◽  
High Speed Photography ◽  
Flame Stability ◽  
Jet Flames ◽  
Jet Flame ◽  
Field Temperature ◽  
Vitiated Coflow

The objective of this paper is to investigate the flame structure and liftoff behaviors of a dimethyl ether central jet in CH4/air vitiated coflow in a coflow burner. The liftoff behaviors of dimethyl ether jet flames in the air flow were studied firstly. The flame stability of the burner was analyzed by measuring the flow field temperature with thermocouples. By changing the coflow rate and CH4 equivalence ratio, the liftoff behaviors of dimethyl ether jet flames under different vitiated coflow environments were discussed. The jet flame structure was also analyzed qualitatively by high-speed photography.

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